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Expression of parathyroid hormone-related protein in rat articular cartilage

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Abstract

Expression and localization of parathyroid hormone-related protein (PTHrP) in rat articular cartilage during fetal and postnatal periods were investigated by immunohistochemistry and in situ hybridization. PHTrP displayed distinct distribution and intensity of staining at different ages. In fetal (18-day-old) and young (3-week-old) rats, articular chondrocytes expressed abundant PTHrP throughout the entire thickness of cartilage. In contrast, in 60-week-old rats, PTHrP was expressed in a few articular chondrocytes of superficial and middle layers. Regulation of PTHrP and PTH/PTHrP receptor mRNA was also studied in cultured rat articular chondrocytes. Northern blot analysis revealed that both transforming growth factor-β (TGF-β), an important stimulator for chondrocyte proliferation and differentiation, and 10% fetal bovine serum (FBS) stimulated the expression of PTHrP mRNA with down-regulation of its receptor mRNA. In contrast, 12-O-tetradecanoylphorbol-13-acetate (TPA) down-regulated the expression of receptor without changes of PTHrP mRNA level. These results suggest that the changes in abundance and localization of PTHrP and its receptor may be directly involved in the cell growth and differentiation of articular cartilage.

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Authors and Affiliations

  1. Department of Cell Physiology, Atomic Disease Institute, Nagasaki University School of Medicine, 1-12-4 Sakamoto, 852, Nagasaki, Japan

    T. Tsukazaki, A. Ohtsuru, H. Yano, K. Motomura, H. Namba & S. Yamashita

  2. Department of Pathology, Atomic Disease Institute, Nagasaki University School of Medicine, 1-12-4 Sakamoto, 852, Nagasaki, Japan

    M. Ito

  3. Department of Orthopaedic Surgery, Nagasaki University School of Medicine, 1-12-4 Sakamoto, 852, Nagasaki, Japan

    H. Enomoto & K. Iwasaki

Authors
  1. T. Tsukazaki
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  2. A. Ohtsuru
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  3. H. Enomoto
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  4. H. Yano
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  5. K. Motomura
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  6. M. Ito
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  7. H. Namba
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  8. K. Iwasaki
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  9. S. Yamashita
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Tsukazaki, T., Ohtsuru, A., Enomoto, H. et al. Expression of parathyroid hormone-related protein in rat articular cartilage. Calcif Tissue Int 57, 196–200 (1995). https://doi.org/10.1007/BF00310258

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  • DOI: https://doi.org/10.1007/BF00310258

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